Carburetor fire baffle



Sept. 5, 1933. R. J. ANSCHICKS GARBURETOR FIRE BAFFLE Filed Aug. 24, 1929 Li 3 a a Patented Sept. 5, 1933 UNITED STATES CARBURETOR FIRE BAFFLE Rudolph J. Anschicks, Chicago, Ill., assignor to Protectoseal Company of America, Chicago, Ill., a corporation of Illinois Application August 24, 1929. Serial No. 388,158 1' Claim. (01. 123-142) My invention relates to carburetors, and more particularly, it relates to improved closure means for the air inlet of a carburetor'which operates as a fire bafile to extinguish flames and a muffler for explosive noises incidental to what isknown as back firing.

An object of the invention is the provision of improved fire bafile construction in combination with the air inlet of a carburetor which is operable to prevent exterior conflagration in the'event of back firingfrom the carburetor.

Another object or the invention is the provision of improved fire baflie construction mounted in the air inlet of a carburetor so as to permit unrestricted flow of air into the carburetor and to prevent the escape or" back fire flames from the interior of the carburetor through the air inlet.

Still another particular object of the invention 20 is the provision of an improved device operable as a fire baffle. and capable of being installed in the main air inlet of a carburetor and which also acts as a muflier to deaden the explosive noises incidental to such back fire explosions.

of a device of the kind described in combination with a carburetor which is simple, compact, durable, reliable, efficient, and satisfactory for its intended purpose. r

Many other objects and advantages of the construction herein describedand shown will be obvious to those skilled in the art from the disclosure herein given.

To this end my invention consists in the'novel 'construction, arrangement and combination of parts herein described and shown and more particularly pointed out in the claim.

Referring now to the drawing forming a part of this specification:

40 Fig.1 is an elevational view showing a carburetor diagrammatically as attached to an automobile engine and having the device of mying, the numeral 10 generally designates a carbu-' 50 retor used in connection with a gas engine. The carburetor comprises an air inlet pipe 11 opening into a mixing chamber 13 and a gas inlet 12 opening into a fioat chamber 14.

The carburetor parts are shown diagrammatically, inasmuch as the invention resides in the pipe 11 of the carburetor.

Another object of the invention is the provision combination of my improved fire bafile, generally designated by the numeral 29, with a carburetor, the bafile being operable to control the air inlet The fioat chamber 14. is fastened to the main body of the carburetor by a plurality of bolts 20. The mixing chamber 13 discharges into a mixture pipe 15 forming the upper portion of the carburetor. The mix ture pipe 15 opens into a pipe '16, leading to the engine which is supplied by the carburetor. The pipes 15 and 16 are provided with flanges 1'7 and 18, respectively. The flanges 1'7 and 18 form,

a fluid tight joint'and are held or fastened togethe'r by a plurality of bolts 19.

The construction shown is typical of any carburotor of the general class described, wherein, by reason of a lean mixture of air and gas, there is incomplete combustion in the engine cylinder, and an explosive back fire through the inlet pipe 11 results. The escape of such aback fire frequently results in the ignition of combustible gases and gas or oil drippings that accumulate about or underneath the engine, thereby causing an undesirable and sometimes dangerous conflagration, Such combustion of the gas and drippings about the engine is avoided and the loud explosive noises incidental to such back fire prevented by mounting my combination fire baiiieand mufiler 29 in the air inlet pipe 11. The fire 'bafile 29 is similar in construction to the apparatus shown and described in my copending applications, Serial #305,088, filed September 10, 1928, and Serial #354,329 filed April 11, 1929.

The balfle 29 comprises a pipe section 21, finished to form a close fit with the interior of the inlet pipe 11. A plurality of slots 22 are formed in the side walls of the pipe section 21 to make it easy to insert the closely fitting section in the air inlet pipe ll. The outer end of the pipe section 21 is provided with a flange 23.

In addition to the ring 21 and the flange 23, the fire baflie comprises an outer disk cover 28, of the same outer diameter, preferably, as that of the flange 23. Between the disk cover 28 and the flange 23 are positioned a plurality of an-' nular plates 24. The plates 24 are preferably of the same width as the flange 23, so that the inner width or cross-sectional area of the space enclosed by the plates corresponds to the opening through the pipe 21. A plurality of washers 25 are positioned between the flange 23 and the adjacent plate 24 and between the disk cover 23 and the adjacent plate 24, as well as between each of the other plates 24. The washers 25 serve to keep the plates 24 an equal distance apart, so that between each two of the annular plates a ring or slit-like opening 26, of the thickness of the washers is formed. All of the washers 25, the plates 24 and the disk cover 28 are held together and. fastened to the flange 23 by means of bolts 27, so that the ring, or slit-like openings 26 cannot be altered.

The total area of the openings 26 should be at least as large as the size of the opening through the pipe section 21, thereby permitting air to enter the carburetor without hindrance. The slit-like openings 26 are made relatively thin so that it is impossible for the fiame burning outwardly in the event or" back fire to penetrate through the openings between the rings on account of the thickness of the openings and the distance the flame has to pass in consequence of the width of the plates 24; The burning gases.

in passing between the plates 24 are cooled sufliciently to extinguish the flame. Since the openings between the various plates 24 are equal in area to the opening through the pipe, the bafiie presents little or no resistance to the escape of gases during back firing while at the same time functioning as a flame extinguisher.

The fire bafile 29 also operates as a mufiier for the carburetor in the case of back fires or explosions for the reason that both the escaping gases and the inrushing air must pass through the plurality of spaces 26, rather than through one single opening.

Thus, it will be seen that I have provided a device suitable for mounting in combination with any typical carburetor for gas engines which serves as a fire baflle to prevent propagation of fire outwardly from the carburetor and also as a muffler to subdue the loud noises and reports which are incidental to the back firing of the carburetor through an open air inlet.

Having thus described my invention, it is obvious that various. immaterial modifications may be made in the same Without departing from the spirit of my invention; hence, I do not wish to be understood as limiting myself to the exact form, construction, arrangement and combination of parts herein described and shown, or uses mentioned.

What I claim as new and desire to secure by Letters Patent is:

A device providing a fire bafile adapted for mounting in an air intake pipe'of a carburetor, said device comprising a flange member having an annular collar closely fitting the carburetor intake pipe, a circular plate in spaced apart relation to said flange member, a plurality oi annular rings arranged in closely spaced relation between said plate and flange, means for holding said flange member, plate and rings in assembled position, and means holding said rings in sufficiently closely spaced relation that spark and flame laden gases accompanying backfiring are quenched upon passing therethrough, the number of said spaces being such that their total area is not less than the cross sectional area of the carburetor intake pipe.

RUDOLPH J. ANSCI-IICKS. 

